Piercing-machine for making tube-blanks.



No. 638,810. I Patented Dec. l2, I899. E. E. DUIMBIY.

PIERCING MACHINE FOR MAKING TUBE BLANKS.

(Application filed July 26, 1899.)

(No Model.) 2 Sheets-Sheet l.

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No. 638,8). 7 Patented Dec. l2, I899. E. E. HUIMBY.

PIEBCING MACHINE FOR MAKING TUBE BLANKS.'

(Applies-flan filed July 26, 1899.) (No Model.) 2 Sheets8heet 2.

UNITED STATES PATENT OFFICE.

EDVARD E. QUIMBY, OF ORANGE, NEW JERSEY, ASSIGNOR TO THE NATIONAL TUBE COMPANY, OF PITTSBURG, PENNSYLVANIA.

PlERClNG-MACHINE FOR MAKING TUBE-BLANKS.

SPECIFICATION forming part of Letters Patent No. 638,810, dated December 12, 1899.

Application filed July 26, 1899.

To all whom it may concern:

Be it known that I, EDWARD E. QUIMB Y, of Orange, New Jersey, have invented certain Improvements in Piercing-Machines for Making Tube-Blanks, of which the following is a specification.

These improvements relate to the type of billetpiercing apparatus employing a stationary upright piercing-punch and a vertically-reciprocable matrix for inclosing and forcing a suitably-hot billet downwardly against the apex of the punch, and thereby compelling the resultantly-displaced metal to flow into the annular space between the surface of the punch and the wall of the descending matrix. In apparatus of the said type heretofore designed for the production of heavy tube-blanks and shown and described in E. F. Holingers pending application, Serial No. 714,644, the matrix is cylindrical and has inserted in its upper end a flanged bushing which is bolted to the top of the matrix-carriage and is adapted to bear upon and transmit to the outer edge of the upper end of the billet the required downward thrust. Such thrust is administered to the middle portion of the upper end of the billet by the lower end of a plunger having a sliding fit in the said bushing and forming a part of a hydraulic ram. The said plunger is provided with a shoulder for bearing upon the top of the tiange -of said bushing, and thereby driving the matrix downward during the working stroke of the ram. In practice when the matrix has been driven down until the top of the billet has nearly reached the apex of the punch the hydraulic ram is elevated until the lower end of said plunger has been raised a suitable distance above the top of the flanged bushing. A bearing-plate is then placed over the bushing to receive the impact of the ram when it again descends for the purpose of driving the matrix farther downward and so causing the punch to punch out a disk of metal from the top of the billet into the hollow bushing, and thereby complete the piercing of the billet from end to end. In the present invention the matrix is rigidl' connected with the hydraulic ram, the flanged bushing is seated in the upper end of the matrix, and there is employed for administering the downward thrust Serial No. 725,145. (No model.)

to the middle portion of the top of the billet a yielding plunger, which during the working stroke of the ram is by means of a chucking instrumentality held within the bushing in such position that its lower end is in the plane of the lower end ofthe bushing. When the matrix has been so far driven down that the top of the billet has nearly reached the apex of the punch, the said chucking instrumentality is dislodged, and the plunger is thereby released, while the matrix is being further driven downward for the purpose of effecting the punching out of the disk of metal from the upper end of the billet into the bushing. If necessary, the ram is at the proper time temporarily relieved from downward pressure to facilitate the dislodgment of the said checking instrumentality. During the return stroke of the ram and matrix for the purpose of stripping the product from the punch the plunger is by means of a cam or otherwise compelled to resume its position within the bushing and to thereby push out therefrom the disk of metal which has been punched out of the top of the billet. The expedient of the yielding plunger operatingas set forth is analogous to that shown and described in my pending application for Letters Patent of the United States, serially numbered 710,592.

The accompanying drawings of a piercingpress containing the present improvements are as follows, viz:

Figure l is a front elevation, partly in vertical section and partly broken away, showing the matrix in its most elevated position and showing in section a billet supported at its recessed lower end upon the apex of the stationary punch. Fig. 2 is a front elevation, partly in vertical section, with the upper part of the hydraulic cylinder omitted, showing the position of the matrix when the piercing operation has so far progressed that it remains only to effect the punching out of the disk of metal from the upper end of the billet and preparatory thereto to dislodge the chuckingcam from the top of the yielding plunger. Fig. 3 is a transverse vertical section of the matrix and adjacent parts, afiording a face View of the chucking-cam when occupying the position in which it is represented in Fig. 2. Fig. 4 is a transverse vertical section showin g the relative positions of the chucking-cam, the central plunger, the matrix, and adjacent parts at the conclusion of the piercing operation. Fig. 5 is a horizontal section taken through the plane indicated by the dotted line as a: on Fig. 2. Fig. 6 is a front elevation of the press with the upper part of the hydraulic cylinder omitted, showing the matrix and stripper so far elevated as to have stripped the pierced billet from the punch.

The piercing apparatus shown in the drawings is composed of the stationary vertical piercing-punch A, the vertically-reciprocating matrix-carriage B, moving on vertical guides O O for suitably adjusting its path of motion with relation to the central longitudinal axis of said punch, the hydraulic cylinder D, secured to the upper ends of the guides G O, a double-acting piston E, traversing the cylinder D and connected by an extension E with a cross-head E to which the matrixcarriage B is detachably secured by means of the vertical bolts F F, which extend below the carriage B and have aflixed to their lower ends the stripper consisting of the cross-bar G, which is perforated to loosely admit the punch A.

The matrix H is securely seated in its carriage B by means of its heavy flange H. A bushing I, removably inserted in the upper end of the matrix H, is provided with a flange 1, which is interposed between the top of the carriage B and the under side of the crosshead E A plunger K, which is adapted to slide in the bushing I and to project at its lower end slightly below the plane of the lower end of said bushing, is loosely suspended by its head in the vertical aperture K in the cross-head E The extension E is provided with a vertical slot L. A pivot L, extending transversely across the upper end of said slot, serves to suspend the chucking-cam li/Lhaving the paracentric bearing-face M and provided with an arm M for facilitating the swaying of the cam upon itspivot L. An adjustable screw-bolt M is inserted through the arm M to serve as a stop for so determining the chucking position of the cam M with relation to the upper end of the plunger K that during the piercing operation the lower end of the plunger K will be in the plane of the lower end of the bushing I and will thus cooperate with the lower end of the bushing in administering the required endwise downward thrust upon the draulic piston is temporarily relieved from,

downward pressure and, if necessary, slightly elevated to facilitate the dislodgment of the chucking -cam from the upper end of the plunger K. Fig. 4 represents the final stage in the downward excursion of the matrix,dur- 7o ing which the disk of metal is punched from the top of the billet into the bushing I. In cooling, the billet shrinks fast to the punch and is stripped therefrom by the stripper-bar G during the upward excursion of the matrix,

as illustrated in Fig. 6.

What is claimed as the invention is- 1. In a press for piercing billets, a vertically-reciprocable hydraulic ram; a stationary vertical piercing-punch; a hollow cylin- 8o drical matrix provided near its upper end with an inwardly-projecting annulus for bearing upon the outer edge of a billet contained within said matrix; a matrix-carriage rigidly connected to said ram; a plunger suspended in a vertical aperture in said ram and adapted to loosely fit the interior of said matrix above said annular shoulder; achuckinginstrumem tality susceptible of adjustment for chucking said plunger in working position and thereby enabling its lower end to cooperate with said annular shoulder in administering the required downward pressure upon the upper end of the billet during a prescribed part of the piercing operation, and for releasing said plunger during the concluding part of the downward stroke of said ram.

2. In a press for piercing billets, a verti cally-reciprocable hydraulic ram; a stationary vertical piercing-punch; a carriage rig- I00 idly connected to and reciprocating with said ram; a hollow cylindrical matrix seated in said carriage; and a circumferentially-flanged bushing removably inserted in the upper end of said matrix.

ED\V. E. QUIMBY.

Vitnesses:

MARY Q. MILLS, W. E. QUIMBY.

Thus in Fig. l the billet is repre- 6o 

